I have been peri for several years now, and I am 45. Welcome to the club! Isn't it great!? Not! Anyway, try doing a search on TE. I know that peri-m, the big-m and middle age have been discussed a lot on here.

Also, I like to hike and walk in addition to biking. But neither of those will burn as many calories as biking. If it wasn't for biking, I know I would likely be carrying some xtra pounds now.